How the Squid Lost Its Shell

  • Publicado el 17 abr 2018
  • The ancestors of modern, squishy cephalopods like the octopus and the squid all had shells. In ancient times, their shell was their greatest asset but it eventually proved to be their biggest weakness.
    Special thanks to Franz Anthony for the beautiful cephalopod reconstructions. You can see more of Franz's tremendous work at
    And thanks as always to Nobumichi Tamura for allowing us to use his wonderful paleoart:
    Produced in collaboration with PBS Digital Studios:
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  • Ciencia y tecnologíaCiencia y tecnología

Comentarios • 2 305

  • Tygr Allure
    Tygr Allure Hace un día


  • You Name It Gaming
    You Name It Gaming Hace 2 días

    Coleoids are incredible creatures.
    They're incredibly intelligent, incredibly adaptable, and incredibly tasty!

  • rkmugen
    rkmugen Hace 2 días

    I'm sorry.... all I can think of is Calamari with Marinara Sauce.....

  • The goatman92
    The goatman92 Hace 2 días

    Was anyone else surprised that Nautilus was not an extinct species and is in fact, a modern day squid? Like seriously

  • Big bone 343
    Big bone 343 Hace 3 días +1

    I took it

  • acchaladka
    acchaladka Hace 3 días +1

    I think Eons videos in general are fantastic and I watch old ones when I have free time. However this was one of your very best, partly because cephalopods are about the most interesting of all species to me. And now Nautiloids. Please do more on the amazing family here. For other topics, I would think more on making chemistry more understandable to the average person - I was 40 before I really got a clue on how chemistry makes the world, and not simply through the Haber-Bosch process.
    Thank you.

  • Mike Hunt
    Mike Hunt Hace 4 días

    John Green works for PBS?

  • Huey Iroquois
    Huey Iroquois Hace 4 días

    The correct plural of octopus is octopodes, not octopuses.

  • Cal6009
    Cal6009 Hace 5 días

    Who the f is Hank?

  • James Bauder
    James Bauder Hace 5 días

    Video on the jawed fish of the Devonian !

  • Jackson Bianco
    Jackson Bianco Hace 5 días


  • Jackson Bianco
    Jackson Bianco Hace 5 días +1

    Bring on the cephalopods man😎👌🏽👍🏽

  • NI CK
    NI CK Hace 5 días

    octopuses will continue evolve and be smart enough to drive soon. too bad self driving cars will a steal their dream away.

  • Stephen Castro
    Stephen Castro Hace 5 días

    How about the history of arthropods including the eurypterids, crustaceans and others?

  • Carolina Cipolla
    Carolina Cipolla Hace 5 días +1

    I would like to know how you know about these events that killed many species. What kind of trail did those events leave so you could ve able to identify them? And how do you do that?! I love the channel by the way

  • Top Pay Position
    Top Pay Position Hace 6 días

    How recent did the ship land that brought octopus here? With their stylus. LOL

  • Vexel Videos
    Vexel Videos Hace 7 días

    3:43 looks like a loaf of tiger bread.

  • Adrian Ortega
    Adrian Ortega Hace 7 días

    Stay fresh!

  • pheonixmon1
    pheonixmon1 Hace 7 días +1

    Why did it take until 2018 for this video to exist? awesome work I love it thank you a lot

  • 張於哥
    張於哥 Hace 8 días

    I'm glad and surprise to not find any creationist in the comments section.

  • Vile IX
    Vile IX Hace 9 días

  • Resh Hollis
    Resh Hollis Hace 10 días

    does that mean that humans will go through the same?

  • Tricia Ann
    Tricia Ann Hace 10 días

    Came for the squids, stayed for the Hank Green

  • Mika Hikyuu
    Mika Hikyuu Hace 10 días

    @6:43 "the same event that killed the non-alien dinosaur"...
    what about the alien dinosaurs, were they oki?

  • Wolfiyee
    Wolfiyee Hace 11 días

    *That* explains the awkward Bill Cipher head shape.

  • Joshua Tupper
    Joshua Tupper Hace 11 días

    *Splatoon memes*

  • ayhab Q
    ayhab Q Hace 11 días

    Gotta love how the squid at 1:04 is blurred like it's nsfw

  • Samuel Muiruri
    Samuel Muiruri Hace 12 días

    do you have one on the evolution period, cambrian and so on simplified?

  • Michael Strouse
    Michael Strouse Hace 13 días


  • A. N.
    A. N. Hace 13 días

    It's like the transition from wearing full Havel armor to being close to absolutely stark-naked.

  • Miraculous Addiction Trash

    “Octopuses” 6:15

    ♥ CHRISTINE ♥ Hace 14 días +1

    "your channel is super awesome!!!" - my 4 yr old
    Thanks !

  • Dj3ntpickle ·
    Dj3ntpickle · Hace 15 días

    Lord helix

  • Galland 34
    Galland 34 Hace 15 días

    By one who knows

  • Hoodie_010
    Hoodie_010 Hace 15 días

    i thought that shell on the thumbnail was a karambit

  • inexplah
    inexplah Hace 16 días

    Can you do a story about limestones and chalk?

  • Fox D
    Fox D Hace 16 días

    Suddenly I'm in the mood for some fried calamari.

  • Sarah DeMarcus
    Sarah DeMarcus Hace 17 días


  • Kyle Casto
    Kyle Casto Hace 17 días

    Hank said that all cephalopods used to have shells. How do we know that? If there were cephalopods without shells, they wouldn’t have fossilized, right?

  • DariusCZH
    DariusCZH Hace 17 días

    But they can't out smart us heh heh >:D

  • Dudeocat Awesome
    Dudeocat Awesome Hace 18 días

    Is that Hank Green?

  • Isaac Roebuck
    Isaac Roebuck Hace 19 días

    I mean it's interesting, but let's be honest here, a lot of this is just guessing. It shouldn't be stated as fact. Sure there's the fossil record but it's not like it's 100% complete, you can't actually observe the animal in action. And some these fossils are exceptionally rare, maybe only two or three examples of the species have ever been discovered. Just not a big enough sample size to rule out coincidental characteristics. Can we construct very reasonable and entirely possible scenarios from highly specific observations? Yes absolutely. Having never observed the actual scenarios taking place on more than just a correlation basis, is it reasonable to state these predictions as fact? No. It's not that we shouldn't discuss it, but we really need more to go off of before these things become accepted facts. Because "Scientists" or a magical sounding word for a university employee that studies material samples along with the observations and reasoning of others like them, are humans. They're normal people with mostly normal lives just like you and me. It's media outlets like this that cloud that into a mystical image of something very abstract, which has very little to do with what these people actually think and do in real life. When really it's quite straightforward. There's no magic in science, there's no abstract in biology. There are things we know, and things we guess are probable based on what we know and/or want to believe. All great topics, fascinating ideas, very real possibilities, we just can't loose sight of the difference between the two.

  • Cow Liver
    Cow Liver Hace 20 días

    well, war, war never changes

  • Turtlee
    Turtlee Hace 20 días

    Siphuncle is fun to say.

  • Pastel Jelly
    Pastel Jelly Hace 20 días

    because shelled squid is ugly

  • tobias carlsson
    tobias carlsson Hace 20 días

    so the humbolt is not a squid ?

  • Holy Doggo
    Holy Doggo Hace 21 un día


  • Steve Steverson
    Steve Steverson Hace 21 un día

    Too bad all the animals from the Cambrian just show up with no precursors or transitional formsor we might know where they came from.

  • Autistic Foamer
    Autistic Foamer Hace 21 un día

    They floated out to the upper ocean, then several million years later decided against it. GG evolution

  • Erlin Sierra
    Erlin Sierra Hace 22 días +1

    awesome channel. subscribing

  • Electro-Cute
    Electro-Cute Hace 22 días

    Love squids and octopuses!

  • Suryakiran Naik
    Suryakiran Naik Hace 22 días

    Great. Could be a bit slower for the likes of me- the general public not conversant with biology. Thanks anyway.

  • Jeff Cockmann
    Jeff Cockmann Hace 23 días

    squids are so amazing.. cuddlefish especially.. its like they are from another planet..

  • Evgeniy Shmukler
    Evgeniy Shmukler Hace 23 días

    What do you know on the setup of DNA-RNA-Protein sequence? Do you think "Membrane-first" or "Duplication-first" is a more like scenario? In both cases - how do you think could the synthesis of membrane components start?

  • DMSProduktions
    DMSProduktions Hace 24 días +1


  • ShadowEcto
    ShadowEcto Hace 24 días +1

    its weird how learning just out of interest is so much more fun than being forced to learn something

  • Not Racist Just White
    Not Racist Just White Hace 24 días +1


  • Quinn VanCanneyt
    Quinn VanCanneyt Hace 27 días

    I thought Sci Show had a different intro? Hank what are you doing here? Lol

  • Anthony Morgan
    Anthony Morgan Hace 27 días

    There are fish that can turn invisible in the water I don’t me camouflage I mean invisible, I want to learn about them, please.

  • belldn3
    belldn3 Hace 27 días

    I didn't understand one word but it sounded cool.

  • Stian Sapiens
    Stian Sapiens Hace 27 días

    So squids are the real sea slugs rofl

  • Rathanak Vlogs
    Rathanak Vlogs Hace 28 días

    Am I wrong for watching the whole video and kept going "mmmmm calamari"

  • W1ll P0w3R
    W1ll P0w3R Hace 28 días

    Do vid on the evolution of hibernation 👌🏼

  • W1ll P0w3R
    W1ll P0w3R Hace 28 días

    6;44 do I hear “non-aliendinosaur”?

  • k tseng
    k tseng Hace 28 días +1

    Learn a lot. Thanks!

  • Christian DP. Sanchez
    Christian DP. Sanchez Hace 29 días +1

    Fantastic video, really well researched and very nicely presented. Two thumbs up! I only wish you'd managed to squeeze in the enormous and uber-fascinating Parapuzosia seppenradensis somewhere... :)

  • Khirja eso
    Khirja eso Hace un mes +1

    Amazing, truly amazing.

  • Zixal
    Zixal Hace un mes

    Took me a moment to recognize the guy from Crash Course.

  • adrift
    adrift Hace un mes

    Finally they buffed Nautilus

  • 1Caff1
    1Caff1 Hace un mes

    It seems the tables have turned.

  • Hypatia4242
    Hypatia4242 Hace un mes +1

    Eon: teach us about coral fossils, please. I don't understand how such slow growing organisms have survived so many catastrophic events when so many others, particularly the ocean dwelling, have gone extinct.

  • Rithrius
    Rithrius Hace un mes

    4:48 PRAISE HELIX!

  • Random player The king of steves

    Why is this so familiar, almost as if we humans had experienced all of that in a different order in only a few thousand years...
    The pioneers = pilgrims, arms race between the fish and the cephalopods = Cold War, and a few other things, the mass extinction = world wars and the before and after, something about it is repeating in short amount of time...

  • Kit 22
    Kit 22 Hace un mes

    Bears 🐻

  • ᴘʟᴀʏᴇʀ 1
    ᴘʟᴀʏᴇʀ 1 Hace un mes +1

    Omanyte in pokemon

  • Daniel K
    Daniel K Hace un mes

    My boy Squidward went from getting gas to taking orders.

  • Naughty adventures of mcBrouhaha in a vacuum

    How do you go from molusk to jawed fish with hyper maneuvirability and scales??

  • braddie77
    braddie77 Hace un mes

    I would love to learn more about the octopus and it's possible connection to 'alien' dna?

  • Alexander Haynes
    Alexander Haynes Hace un mes +1

    Splatoon Lore

  • Stekar Knugen
    Stekar Knugen Hace un mes

    awww look at that little guy, little did he know he would evolve to become the greatest fear of all Japanese school girls

  • Aadam
    Aadam Hace un mes

    If i knew Hank hosted some of this channel's content I would've clicked on this video alot faster.

  • Don Wald
    Don Wald Hace un mes

    Plus they're very tasty!

  • J Thin
    J Thin Hace un mes

    Best video for drinking game!
    Difficulty levels:
    Easy: “mollusk”
    Medium: “cephalopods”
    Expert: “ shell”
    Hardcore: “ every hand movement”

  • Jason Creamer
    Jason Creamer Hace un mes

    Is the gladius named after the sword or is the sword named after the gladius ?

  • Fabiuchifly y demases
    Fabiuchifly y demases Hace un mes +1

    Watting a stupid splatoon comment

  • Ghostoast 9
    Ghostoast 9 Hace un mes +1

    Here because of Splatoon

  • Taylor Sulva
    Taylor Sulva Hace un mes

    Absolutely engaging and educative. Epic. We'd like to see more about the Devonian period and the creatures that lived there. Additionally, mosasaurs and the food web that existed back then.

  • JustSomeTimber1nTheLake
    JustSomeTimber1nTheLake Hace un mes +2


  • Adelise Abbington
    Adelise Abbington Hace un mes

    What was that Pokémon again?

  • xLaCrano
    xLaCrano Hace un mes

    I didn't know Hank was on PBS as well!?

  • Andrew Bellavie
    Andrew Bellavie Hace un mes

    All hail our tentacled overlords

  • Tyler shavinski
    Tyler shavinski Hace un mes

    If coeliods learned to live and even thrive without their shells then why are noctis (noctloids?) Still around thats what i dont understand as animals evolve and more and more efficient forms of life are brought into existance why are less efficent forms allowed to stay. If "only the strong survive" why are the weak still here after eons of time.

  • Murcia
    Murcia Hace un mes +1

    Subscribed. I wish I had youtube back in my schooldays x) gj carry on

  • WVgunnut !!
    WVgunnut !! Hace un mes

    And that squid was me?

  • Fairy ASMR
    Fairy ASMR Hace un mes +1

    How did I not know about this channel until now

  • Nyctophora
    Nyctophora Hace un mes

    A little mollusc in a party hat.

  • cringey Random stuff
    cringey Random stuff Hace un mes


  • Mama Jama
    Mama Jama Hace un mes

    Wait a minute.. am I watching the scishow? Or Hank finally got a job?

  • LuicD
    LuicD Hace un mes

    Is this Macro or Micro evolution, or is this not evolution at all?

  • Joseph Stalin
    Joseph Stalin Hace un mes +2